.van-search .van-field__left-icon{
  color: #999;
}
.van-search input::input-placeholder {
  color: rgba(0, 0, 0, 0.2);
}
.van-icon.van-icon-search:before {
  content: '';
  display: inline-block;
  width: 12px;
  height: 12px;
  background-image: url('//static.ydlcdn.com/m/images/course/search.png');
  background-size: cover;
}
.van-image {
  overflow: hidden;
}